SU1311623A3 - Metallurgical furnace for melting finely pulverized sulfide lead concentrates in suspended state - Google Patents

Abstract

The invention concerns a means for separating molten particles from the exhaust gases of metallurgical furnaces and for returning them to the furnace space (3). As taught by the invention, a molten dust cyclone has been provided substantially within the furnace space (3) or in its immediate vicinity, this cyclone comprising a vertical cylindrical chamber (4), a passage (8) leading from the furnace space (3) tangentially to chamber (4), an exit aperture (5) in the upper part of the chamber for removing the gas and a tap aperture (6) in the lower part of the chamber for returning to the furnace space (3) the solid and molten material that has separated from the gas. The invention furthermore concerns a way recover lead from the exhaust gases of a metallurgical furnace by regulating the oxygen partial pressure in the exhaust gases to be in the range of about 10-16 to 10-10 atmospheres at temperature 1250 DEG -1450 DEG K. and by subjecting the exhaust gases immediately to centrifugal separation to the purpose of separating lead fog droplets from the gas to the purpose of returning the molten lead to the furnace.

Description

This invention relates to non-ferrous metallurgy, in particular to furnaces for smelting in suspension of finely divided lead sulfide concentrates.

The purpose of the invention is to reduce lead losses with waste gases.

FIG. 1 shows the oven, front view; in fig. 2 is a section A-A in FIG. one.

The furnace contains a horizontal chamber 1 with a bottom 2 5 vertical reaction shaft 3 for smelting in a suspended state, a vertical shaft 4 for removal of exhaust gases, a vertical chamber 5 connected by a ca. with a horizontal chamber at the level of the bottom, a hole 7 connecting the upper part of the vertical chamber to the gas exhaust shaft, and a tangentially located channel 8 connecting the vertical and horizontal chambers, the water supply device 9 and the charging nozzle 10.

The furnace works as follows. From the roof of the furnace for melting in suspension through the nozzle 10, concentrate and oxygen or oxygen-enriched air are suspended in the form of a suspension into the reaction shaft 3 or zone for melting in suspension, when the direction of movement of the suspension in the smelting furnace changes. the main part of the molten solid material in it is separated from the gases and settles to the bottom of the chamber 1. The gas containing sulfur dioxide separated from the suspension in chamber 1 contains a mechanical drink and melted drops of lead compounds,

A vertical chamber 5 or a hot cyclone is located below the vertical shaft 4 or zone of the ascending stream, from which the purified gases exit through the opening 7. Gas is given a tangential motion, resulting in molten droplets contained in the gas, hit the walls of the cyclone and flow in the sump

 through channel 6. Channel 6 is positioned so that the melted-drop, current BHHS / does not meet with gases. Channel 6 ends at the ke surface of the melt. The tangential inlet 8, through which gases enter the cyclone, is of such dimensions that the gas velocity is optimal for extracting molten Kschel. In order that with the help of a cyclone it is possible to separate a significant part of lead compounds in the gas phase, the gases can be cooled before the cyclone with water through adaptation 9.

Claims (1)

Invention Formula Metallurgical furnace for melting in suspension fine-grained metal sulphide lead concentrates containing a horizontal chamber with a hearth and vertical reaction shaft connected to the chamber for melting in suspension and a shaft for diverting an upward flow of gases with a dp device for separating solid and molten particles from the flue gases and returning them to furnace, characterized in that, in order to reduce the loss of lead with flue gases, the device for separating solid and molten particles is made in the form of a vertical cylindrical chamber placed in Horizontal chamber under the shaft for discharging the gas stream upstream vsh1e hearth and placed tangentially-connected channel with a horizontal camera in the upper part of the vertical chamber: the device has an opening for the release of gases into the mine to divert the upward flow of gases and in the lower vertical chamber there is a channel connecting it with a horizontal chamber at the bottom level, and the horizontal chamber is equipped with a water supply device located in front of the tangential channel vertical camera device. Have F1 / & 2 Compiled by V. Krasin Editor A. Lezhnin Tehred L. Oleinik ° ±. З1к1з 907; 5Г tyr1 b05Subscribe VNIIPI State Committee oiig for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production printing enterprise, Uzhgorod, st. Project, 4